I have been increasing my expertise in distributors lately. After giving a tech session to our Club T-MG group that included restoring a Sun Distributor Machine to demonstrate. My research included learning to read the codes aon the vacuum advance units. Such as 5-13-10, which means that the advance starts at 5 inches of mercury, goes to 13 and advance is limited to 10 degrees. The 10 degrees distributor advance equals 20 degrees at the flywheel. I have a Lucas reference book that covers most British cars from 1965 thru 1976, including Rovers.
Distributors for P-5's are 25D6 40895 for high compression and 40896 for low compression. For 2000 1966-67 HC, 25D4 (all) 41119, LC 41036, 1967 TC 41216, 1968-70 Saloon and Automatic , 41200, TC 41199, 1970-71 41316. For 3500 S 1970-71 it is a 35D8 model 41277.
P-5's the 40895 uses a p/n 54414411 vacuum advance and the 40896 uses a 54411598. P-6's the 41119 uses a 54418074, the 41036 uses a 54415212, the 41216 uses a 54411983, the 41200 uses a 54418074, the 41316 uses 54421817. P-6B's the 41277 uses a 54421060 vacuum unit. There is some interchangeablility in that for example a certain vintage of MGB may use the same vacuum unit and/or distributor as a P-6. The part numbers and in some cases both the p/n and advance numbers are stamped on the vacuum advance units. Some have both but all should have the part number.
Good hunting. By the way, MOSS motors only carries two vacuum advance units currently for MGB (one size fits all!). One is for 1962 thru 1971 and the other is 1972 thru 1974. The 1972-74 vacuum port was the manifold rather than the rear carburetor port. The begining of smog stuff.
Slats
-------------- Original message ----------------------
From: Kent Kinard <kentkinard at verizon.net>
> Hi Bill,
> Did you not get my last email? I got no acknowledgment until I read
> this post on Rovernet. A new distributor should have vacuum advance for
> good fuel economy. I will be interested in what others have to say
> about the Kent 218 cam and Rhodes lifters... Buick and Rover lifters
> are identical but some are better (more expensive) for more radical
> cams. Crane lifters will go about 1000 rpm higher before pump up than
> stock Rover or Buick lifters.
>> Roverly,
> Kent K.
>> Bill Robertson wrote:
> > I'm now going to start to the 3500S after last years health
> fiascos...............I've got a set of 3.9 heads from a Landy and will get a
> 3.9 cam or such ....(i have a Kent 218 cam i got cheap at flea market but i've
> been told it may be too much for what i'm doing and give bad idle
> etc...........i'm interested in the Rhoads lifters and wonder if they are the
> ones listed for Buick 215 (part # 9698 ) or are there Rover specific...if the
> Buick ones are right they are miles cheaper right from Rhoads...........i'm also
> wondering if i get another distributor should i get vacuum advance or
> mechanical
> > Off to the garage to start to pull the motor out.................Its starting
> to warm up round here now so not so frigid in garage...........
> >
> > Cheers
> > Bill Robertson
> >
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